<template>
  <div class="todo-header">
    <input 
			type="text" 
			placeholder="请输入你的任务名称，按回车键确认" 
			@keyup.enter="handleEnter"
		/>
  </div>
</template>

<script>
	import {nanoid} from 'nanoid'

	export default {
		name: "Header",
		props:['addTodo'],
		methods: {
			//回车按键的回调
			handleEnter(event){
				//获取用于的输入
				let {value} = event.target
				//校验数据
				if(!value) return alert('输入不能为空！')
				//将用户的输入包装成一个todo对象
				const todoObj = {id:nanoid(),title:value.trim(),done:false}
				//调用父组件传递过来的addTodo
				this.addTodo(todoObj)
				//清空输入
				event.target.value = ''
			}
		},
	};
</script>

<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px rgba(82, 168, 236, 0.6);
}
</style>